-31.8% is the change from 500 to 341
Calculation steps:
[( 341 - 500 ) ÷ 500] x 100 = -31.8%
Formula
Percentage change = [(341 - 500) / 500] x 100
Subtract the new number by the original number
341 - 500 = -159
-159 ÷ 500 = -0.318
-0.318 x 100 = -31.8%